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Bugfixes
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* 440 Fix authorization for the Pale Moon browser by jwijenbergh
* 448 Fix backwards compatibility with older GTK versions (e.g. Ubuntu 18.04) by jwijenbergh
Enhancements
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* 437 Switch from /info.json to /.well-known/vpn-user-portal by fkooman
* 443 Use the vault archive for CentOS 8 in the CI by jwijenbergh
* 449 Add an error popup if no device of the primary connection is managed by NetworkManager by jwijenbergh
* 450 Add missing gir1.2 nm package for Debian based systems to the Makefile by jwijenbergh
* 452 Move from CentOS 8 in the CI to CentOS stream 8 by jwijenbergh
* 453 Remove change location button by jwijenbergh